Source : Webster's Revised Unabridged Dictionary (1913)

Film \Film\, n. (Photog.)
   The layer, usually of gelatin or collodion, containing the
   sensitive salts of photographic plates; also, the flexible
   sheet of celluloid or the like on which this layer is
   sometimes mounted.

   {Celluloid film} (Photog.), a thin flexible sheet of
      celluloid, coated with a sensitized emulsion of gelatin,
      and used as a substitute for photographic plates.

   {Cut film} (Photog.), a celluloid film cut into pieces
      suitable for use in a camera.